The massive Diprotodon was Australia's largest marsupial, a gentle giant of the Pleistocene era.

Nature · Published 3 October 2026 Swipe more like this →

In short: Imagine a wombat the size of a rhinoceros. Diprotodon optatum, the largest marsupial to ever roam the earth, dominated the Australian landscape for thousands of years alongside early indigenous people. Despite its imposing stature and potential for massive daily consumption of vegetation, this herbivore remains a mystery of prehistoric biology.

Diprotodon optatum was a heavily built, large-bellied quadruped that reached lengths of just under 4 metres and weights up to 2800 kilograms. As the first fossil mammal named from Australia, it was formally described by Richard Owen in 1838. Its name, derived from Greek, refers to its two forward-directed lower incisors, a signature trait of the order Diprotodontia. These animals possessed sturdy, pillar-like limbs and feet that turned inward, sharing a structural similarity with modern wombats.

These megafauna were widespread across Australia, preferring semi-arid plains, savannahs, and open woodlands. Evidence suggests they were herbivores that may have consumed 100 to 150 kilograms of vegetation daily, using chisel-like incisors to root out plants. While early depictions often showed them moving in large herds, scientists now believe they likely traveled in smaller family groups, particularly when drawn to water sources during periods of drought. Their habitat was significantly shaped by the Pleistocene oscillations, which caused dramatic shifts between dry, windy conditions and more stable climates.

The extinction of Diprotodon occurred about 25,000 years ago, marking the end of a long period of co-existence with the first indigenous Australians. While the exact cause remains a subject of investigation, researchers point to a combination of extreme environmental stress, such as extended droughts, and potential pressure from human activity. Evidence for the latter is rare, though one specimen from Tambar Springs features a small, square hole on a rib that may have been caused by a spear. This massive creature, which once stood as a titan of the Australian interior, continues to offer insights into the complex history of marsupial evolution and the fragility of megafauna in a changing world.

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